Motor A must start before B with push button 1 Motor B start 5 sec after motor A Automatically Both motors must be able to stop on its own The E stop must stop both On delay timer after motor A

Motor A must start before B with push button 1 Motor B start 5 sec after motor A Automatically Both motors must be able to stop on its own The E stop must stop both On delay timer after motor A.

The correct answer and explanation is:

Correct Answer:

To achieve the described motor control logic, use the following setup:

Components Required:

• Push Button 1 (Start)
• Emergency Stop (E-Stop)
• Motor A Contactor
• Motor B Contactor
• On-Delay Timer (5 seconds delay)

Control Logic:

1. Pressing Push Button 1 energizes Motor A immediately.
2. The on-delay timer (set to 5 seconds) is activated at the same time Motor A starts.
3. After 5 seconds, the timer closes its normally open contact, allowing Motor B to start.
4. Each motor can stop automatically through its own control or overload relay.
5. Pressing the E-Stop cuts power to both motors immediately.

Explanation (300 words):

The control sequence ensures a safe and timed startup of two motors using a single push button and an on-delay timer. This type of sequential motor control is essential in industrial operations where equipment must start in a specific order for safety or process reasons.

When Push Button 1 is pressed, it completes the circuit to energize the contactor for Motor A. At the same time, the on-delay timer is triggered. This timer is programmed for a delay of 5 seconds, during which it keeps its contact open. After the delay, the timer contact closes, energizing the contactor for Motor B.

This setup ensures Motor B does not start until 5 seconds after Motor A has started. This delay may allow Motor A to reach operational speed or complete a pre-process before Motor B begins.

Both motors can be equipped with automatic stop mechanisms such as limit switches, thermal overload relays, or control logic that stops them based on certain conditions like temperature, load, or completion of a cycle.

The Emergency Stop (E-Stop) is wired in such a way that pressing it immediately interrupts the power supply to both contactors, cutting off Motors A and B instantly. This provides a safety mechanism that allows operators to halt operations in case of a fault or danger.

Such a control system is common in conveyor systems, mixers, or staged processes where equipment dependency and safety are critical.